Toshiba RAS-M10GDCV-E Installation Manual page 15

Points at installation work
General cautions
1. Considering installation places of indoor unit and supply chamber, and structure of the building, determine the duct path.
2. In order to utilize the static pressure characteristics of the air supply in the indoor unit, design the duct branching by setting size
up to the air supply chamber or by setting length to the first branch as long as possible (Min. 200 mm or longer) so that an even
air volume can be obtained.
Especially, when setting the branching point just after air supplying of the indoor unit, air concentrates at the center part and air is
difficult to flow to the ducts at both sides.
3. Connect each connecting section surely, and apply sufficient thermal insulation.
In this model which the duct is branched in the ceiling, compared with the general houses, the high temperature generates on the
periphery in the cooling time (especially, at attic and etc.), temperature difference increases between the supply air and outside of
the duct, and dewing may occur.
Dewing on the surface of the thermal insulator covering exposure of the metal connecting section or leaking portion of the cooling
air may cause a trouble such as falling of water drop.
4. Thermal insulation of screwing sections is necessary.
Avoid dewing by applying thermal insulation to 6 screws which fix the duct flange of the air supply chamber.
• For duct parts, the flexible branch duct (thermal insulation, 25 mm or more thickness) is recommended.
• Adjust the duct length to 6 m or less even for straight pipe, and avoid sudden bending (part resistance is large.) if bending.
Return air flange
8-φ5 mm holes
11
Supply air flange
6-φ5 mm holes
EN